Of course we can take pain relief and go off and do something else. That in itself is a strategy. It combines belief ( the medication will do its job) with distraction (occupying the mind).
What if we could do something else? What if we could learn how pain medication works? What if we could imagine the journey that the pain medication makes and imagine it getting the outcome that we want?
in this video I describe a process that used when I absolutely needed to have a tablet. Here's a link to a TedEd video that will help both your understanding of the pain relief process as well as your ability to visualise.
I hope this helps.